Control system and control method of oil-air dual-fuel engine with electronically controlled fuel supply

Abstract

The invention discloses a control system and a control method of an oil / gas dual-fuel engine in electronic control oil supply. The control system comprises a high-pressure common-rail injection system, a fuel gas injection system and an oil / gas dual-fuel electronic control system, wherein the oil / gas dual-fuel electronic control system comprises a sensor part, an actuator, a dual-fuel ECU (Electronic Control Unit) and a fuel oil ECU, the oil / gas dual-fuel electronic control system controls the diesel oil amount through an oil injector, the fuel gas amount through a fuel gas control injection nozzle and the air inlet amount through an electronic throttling valve body, and an air-fuel ratio when the oil / gas dual-fuel engine works can be detected and controlled in a closed loop feedback way through a wide-domain oxygen sensor. According to the control method disclosed by the invention, the oil / gas dual-fuel engine can be switched under a pure fuel oil working mode and a fuel oil / fuel gas dual-fuel working mode, the good running of the oil / gas dual-fuel engine can be controlled, the diesel injection amount can be accurately controlled according to different working states of a diesel engine, the injection time, the injection duration, the air inlet amount and the air-fuel ratio of gas fuel can also be controlled, thus the safe and stable running of the dual-fuel engine can be ensured, the fuel consumption can be reduced, and the exhaust gas emission can be reduced.

Description

technical field [0001] The invention belongs to the technical field of engine control, and in particular relates to a control system and a control method of an electronically controlled oil-supply oil-air dual-fuel engine. Background technique [0002] With the increasingly tense oil resources, the world's fuel prices have soared again and again, and my country's oil prices have also risen again and again. Gas fuels such as natural gas, which are abundant in the earth, have a price advantage compared with gasoline and diesel, and have better environmental protection. Its use can effectively reduce the cost of using diesel engines, alleviate energy shortages, and solve problems such as emission pollution. Therefore, it is necessary to develop gas fuel engines. And diesel / gas fuel dual-fuel engine (abbreviation oil-gas dual-fuel engine) is exactly a kind of gas fuel engine. Existing diesel / gas fuel dual fuel engines, such as diesel / natural gas dual fuel engines and diesel / liqu...

AI Technical Summary

Problems solved by technology

However, the invention still has shortcomings such as insufficient optimization of the structure, insufficient safety and reliability of engine operation, etc.

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